91199

Properties

Appears in sequences

• Primes that contain digits 1 and 9 only.at n=12A020457
• Emirps starting and ending with composite digit 9.at n=19A128374
• Smaller of two consecutive prime numbers such that p1*p2*d - d = average of twin prime pairs, d (delta) = p2 - p1.at n=11A153378
• Emirps with digits 1 and 9 only.at n=2A155507
• Lesser of emirps (pairs) with digits 1 and 9 only.at n=1A155508
• Primes having only {0, 1, 9} as digits.at n=42A199329
• Initial member of 10 consecutive primes {a, b, c, d, e, f, g, h, i, j} such that (j - e) = (i - d) = (h - c) = (g - b) = (f - a).at n=8A293393
• Prime numbersat n=8821